在民事诉讼中,由于特殊原因,原来当事人的诉讼权利转让给新的当事人,由新的当事人享有原当事人的诉讼权利,承担其诉讼义务,这种变化被称为( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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